Hi all, First time poster. I've enjoyed reading the threads and have learned a ton from you all. I am eternally grateful! I've had hens for several years, but haven't dealt with this situation before and I'm kind of at a loss. Flock last year was all killed by a sneaky fox. In March I got 3 new chicks. They are now laying and happy, healthy girls. 3 weeks ago, I got two more "started" girls (10-12 weeks old) from a farm nearby. They are in with the big girls but they have a little section of the coop where they can squeeze into (and the big girls can't) so they are protected. The little ones have food and water in there, but are also free to go out into the main coop. The little ones came to me and were sneezing a bit, but didn't have any nasal discharge, etc., so I thought they were just adjusting to their new home. The sneezing didn't let up so I thought I should treat them with an antibiotic (Duramycin-10). About a week after I got them, I put antibiotic in all the water since they all had contact with each other. I treated for one week, then took them off of it. No change in the sneezing. This morning the little australorp was lame. She can't stand up, and she kind of flops around. No obvious injuries, and her nose is now blowing snot bubbles and crusty with dirt and snot. Still eating, drinking, pooping normally. No blood in poop. Eyes look healthy. I put all of them back on antibiotic to hopefully protect the others, and I separated her from the other little one. They are both separated from the big girls now, and from each other. Any suggestions as to what this is? Can she recover? Are the other hens at risk? Thanks so much for all your wisdom!